大型企业SAN数据存储方案设计

在企业级数据存储领域,SAN技术的应用逐渐广泛.这里介绍目前存储技术的现状及SAN同其他存储技术的差异,随后阐述了选择设计SAN存储方案的要素,最后给出某大型企业Z在两个城市建立一体化存储系统的方案实例.     

网络存储技术及SAN存储方式的设计与应用

网络上的数字信息呈爆炸性增长，SAN(Storage Area Network，存储区域网)越来越多地在企业级存储中得到应用。SAN的虚拟化是存储系统的发展趋势，它在文件系统层实现。SAN虚拟化的目的就是让用户和应用系统把SAN作为一个单一的资源池来存取和控制。通过对目前几种SAN的存储虚拟化技术的对比．分析了存储虚拟化的技术关键，并给出了一种基于网络的SAN存储虚拟化的实现方案。本文系统的介绍了网络存储的概念，并分析和比较了几种网络存储技术各自的优势所在和应用。     

网络存储技术及SAN存储方式的设计与应用

网络上的数字信息呈爆炸性增长,SAN(StorageAreaNetwork,存储区域网)越来越多地在企业级存储中得到应用。SAN的虚拟化是存储系统的发展趋势,它在文件系统层实现。SAN虚拟化的目的就是让用户和应用系统把SAN作为一个单一的资源池来存取和控制。通过对目前几种SAN的存储虚拟化技术的对比,分析了存储虚拟化的技术关键,并给出了一种基于网络的SAN存储虚拟化的实现方案。本文系统的介绍了网络存储的概念,并分析和比较了几种网络存储技术各自的优势所在和应用。     

NAS和SAN的融合方案与研究

NAS系统和SANs是网络存储技术发展的两个主要方向．NAS和SAN的融合可以解决SAN和NAS之间存储共享问题，提高效率，是存储需求的趋势．本文对NAS和SAN的关系以及它们融合涉及的技术进行了论述，然后给出了它们融合的方案及特点．     

SAN和NAS融合构架数字档案馆信息存储管理平台

阐述了NAS和SAN融合的数据存储技术在数字档案馆中的应用,详细介绍了目前主要的网络存储技术,网络附加存储(Network Attached Storage,NAS)和存储区域网(Storage Area Network,SAN),以及运用这两种技术融合设计数字档案馆存储系统。     

中小企业SAN数据存储方案设计

本文论述了存储技术的应用现状及发展方向,对不同的存储技术原理和应用进行了描述,总结了三种存储技术的应用和技术本身存在的优缺点.通过技术分采用基于iSCSI协议的IP SAN技术,设计并实现了基于IP网络的且符合中小企业数据存储方案.     

基于FC SAN和IP SAN架构的数字图书馆综合网络存储应用

概述了目前常用的网络存储技术,并提出了一种基于FC SAN和IP SAN架构的数字图书馆综合网络存储整体应用方案,以满足数字图书馆所面对的数据安全、可靠存储及有效利用的挑战和需要。     

一种基于混合云的邮件存储方案研究

针对传统的存储技术,如DAS、NAS、和SAN已经不能满足飞速增长的邮件存储需求,提出了一种基于混合云的存储方案。通过采用不同的存储策略来存储不同类型的邮件,在可扩展性、存储性能、安全备份、异地容灾等方面都能很好地满足邮件的存储需求。     

NEC推出S1400 催熟中小企业SAN市场

“中小企业需要SAN么?不需要么?……”遍布在中国，数以千万计的中小企业，千差万别，信息化水平大相径庭，对存储的需求不能一概而论。几年前，拥有性能、可靠性、可管性等优势的SAN，曾被看作大型商业机构才采用的存储方案。而对教育、普通企业来说，SAN还是遥远的事。但随着SAN存储技术、功能的不断发展变革，同时在价格上更具亲和力，很多中小企业开始将SAN列入了IT投资预算。     

SAN存储技术研究

SAN是通过专用高速网将一个或多个网络存储设备和服务器连接起来的专用存储系统，未来的信息存储将以SAN存储方式为主。可采用光纤通道、IP／Ethernet、InfiniBand互联技术分别组建FC-SAN、iSCSI-SAN和InfiniBand-SAN。对SAN这一最具发展潜力的网络存储技术进行了较为全面的介绍，重点研究了iSCSI-SAN和InfiniBand-SAN这两种新的存储技术。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.